Keystones — Cornerstone
Five GCSE retrieval questions · 20 April 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 96 + ? = 160
Answer: 64 -
2. Algebra
Factorise: 24x + 24
Answer: 4(6x + 6) -
3. Geometry
Calculate the area of a right triangle with perpendicular sides 10cm and 12cm
Answer: 60cm² -
4. Ratio
Simplify the ratio 9:6
Answer: 3:2 -
5. Statistics
Calculate the mean of: 16, 17, 26, 28, 33, 14, 16, 37
Answer: 23.4